Add qr html export mode to key export command

docs/conf.py

@@ -140,7 +140,7 @@
 # so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['borg_theme']
 
-html_extra_path = ['paperkey.html']
+html_extra_path = ['../src/borg/paperkey.html']
 
 # If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
 # using the given strftime format.

setup.py

@@ -666,6 +666,9 @@ def run(self):
             'borgfs = borg.archiver:main',
         ]
     },
+    package_data={
+        'borg': ['paperkey.html']
+    },
     cmdclass=cmdclass,
     ext_modules=ext_modules,
     setup_requires=['setuptools_scm>=1.7'],

src/borg/archiver.py

@@ -271,7 +271,10 @@ def do_key_export(self, args, repository):
             if not args.path:
                 self.print_error("output file to export key to expected")
                 return EXIT_ERROR
-            manager.export(args.path)
+            if args.qr:
+                manager.export_qr(args.path)
+            else:
+                manager.export(args.path)
         return EXIT_SUCCESS
 
     @with_repository(lock=False, exclusive=False, manifest=False, cache=False)
@@ -1938,6 +1941,9 @@ def process_epilog(epilog):
         subparser.add_argument('--paper', dest='paper', action='store_true',
                                default=False,
                                help='Create an export suitable for printing and later type-in')
+        subparser.add_argument('--qr-html', dest='qr', action='store_true',
+                               default=False,
+                               help='Create an html file suitable for printing and later type-in or qr scan')
 
         key_import_epilog = process_epilog("""
         This command allows to restore a key previously backed up with the

src/borg/keymanager.py

@@ -2,6 +2,7 @@
 import binascii
 import textwrap
 from hashlib import sha256
+import pkgutil
 
 from .key import KeyfileKey, RepoKey, PassphraseKey, KeyfileNotFoundError, PlaintextKey
 from .helpers import Manifest, NoManifestError, Error, yes, bin_to_hex
@@ -77,16 +78,27 @@ def store_keyblob(self, args):
         elif self.keyblob_storage == KEYBLOB_REPO:
             self.repository.save_key(self.keyblob.encode('utf-8'))
 
+    def get_keyfile_data(self):
+        data = '%s %s\n' % (KeyfileKey.FILE_ID, bin_to_hex(self.repository.id))
+        data += self.keyblob
+        if not self.keyblob.endswith('\n'):
+            data += '\n'
+        return data
+
     def store_keyfile(self, target):
         with open(target, 'w') as fd:
-            fd.write('%s %s\n' % (KeyfileKey.FILE_ID, bin_to_hex(self.repository.id)))
-            fd.write(self.keyblob)
-            if not self.keyblob.endswith('\n'):
-                fd.write('\n')
+            fd.write(self.get_keyfile_data())
 
     def export(self, path):
         self.store_keyfile(path)
 
+    def export_qr(self, path):
+        with open(path, 'wb') as fd:
+            key_data = self.get_keyfile_data()
+            html = pkgutil.get_data('borg', 'paperkey.html')
+            html = html.replace(b'</textarea>', key_data.encode() + b'</textarea>')
+            fd.write(html)
+
     def export_paperkey(self, path):
         def grouped(s):
             ret = ''